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R1234D311A Datasheet(PDF) 5 Page - RICOH electronics devices division |
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R1234D311A Datasheet(HTML) 5 Page - RICOH electronics devices division |
5 / 26 page R1234D 5 ELECTRICAL CHARACTERISTICS • R1234DxxxA Topt =25°C Symbol Item Conditions Min. Typ. Max. Unit VIN Operating Input Voltage 2.4 5.5 V VOUT Step-down Output Voltage VIN =VCE=VSET+1.5V, VMODE =0V, IOUT=10mA Typ. ×0.98 VSET Typ. ×1.02 V ∆VOUT/∆Topt Step-down Output Voltage Temperature Coefficient −40°C < = Topt < = 85°C ±150 ppm/ °C fosc Oscillator Frequency VIN =VCE=VSET+1.5V 425 500 575 kHz IDD Supply Current VIN =VCE=VSET+1.5V, VOUT =VMODE=0V 230 300 µA Istandby Standby Current VIN =5.5V, VCE=VOUT=0V 0 5 µA RONP ON Resistance of Pch Transistor VIN =5.0V 0.2 0.4 0.9 Ω RONN ON Resistance of Nch Transistor VIN =5.0V 0.2 0.6 0.9 Ω ILXleak LX Leakage Current VIN =5.5V, VCE=0V, VLX =0V or 5.5V −5.0 0.0 5.0 µA IVOUTleak VOUT Leakage Current VIN =5.5V, VCE=0V, VLX =0V or 5.5V −0.1 0.0 0.1 µA ICE CE Input Current VIN =5.5V, VMODE=0V, VCE =5.5V or 0V −0.1 0.0 0.1 µA IMODE MODE Pin Input Current VIN =5.5V, VCE=0V, VMODE =5.5V or 0V −0.1 0.1 µA VCEH CE "H" Input Voltage VIN =5.5V, VOUT=0V 1.5 V VCEL CE "L" Input Voltage VIN =2.4V, VOUT=0V 0.3 V VMODEH MODE "H" Input Voltage VIN =VCE=5.5V, VOUT=0V 1.5 V VMODEL MODE "L" Input Voltage VIN =VCE=2.4V, VOUT=0V 0.3 V Maxduty Oscillator Maximum Duty Cycle VMODE =0V 100 % tstart Delay Time by Soft-Start function at no load, VIN =VCE=VSET+1.5V 0.5 1.5 2.5 ms VLXlim LX Limit Voltage VMODE =VOUT=0V, VIN =VCE=3.0V VIN −0.15 VIN −0.35 VIN −0.65 V Tprot Delay Time for protection circuit VIN =VCE=VSET+1.5V, VMODE =0V 0.5 1.5 2.5 ms VUVLO1 UVLO Threshold Voltage VIN =VCE=2.5V→1.5V, VOUT =0V 1.8 2.1 2.2 V VUVLO2 UVLO Released Voltage VIN =VCE=1.5V→2.5V, VOUT =0V 1.9 2.2 2.3 V VFMduty VFM Duty Cycle VIN =VCE=VMODE=2.4V, VOUT =0V 55 65 85 % |
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